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HW7s.pdf - Homework 7 Solutions Astronomy 7 TF: Lauranne...

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Homework 7 SolutionsAstronomy 7TF: Lauranne LanzSpring 2009Problems:1. The major final product of silicon fusion is56Fe. an isotope of iron with 26 protons and30 neutrons. This is also the most common isotope of iron found on Earth. Discuss whatthis tells you about the origin of the solar system.
2. What prevents thermonuclear reactions from occurring at the center of a white dwarf? Ifno thermonuclear reactions are occurring in its core, why doesn’t the star collapse?
3. What are neutron stars? What led scientists to propose their existence?
4. What is degenerate neutron pressure? How does it make it possible for a neutron star tobe more massive than the Chandrasekhar limit for white dwarfs?
1
It is not possible to have two neutrons in the same state at once.This fact preventsgravity from forcing the neutrons in a neutron star too close together. Since neutrons aremore massive, they provide more pressure, so a neutron star can be heavier than a whitedwarf.

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Term
Spring
Professor
NoProfessor
Tags
Supernova, White dwarf, Neutron star

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